The manager of a computer retail store is concerned that his suppliers have been giving him laptop with lower than average quality. His research shows that replacement times for the model laptop of concern are normally distributed with a mean of 3.6 years and a standard deviation of 0.5 years. He then randomly selects records on 44 laptop sold in the past and finds that the mean replacement time is 3.4 years. Find the probability that 44 randomly selected laptops will have a mean replacement time of 3.4 years or less. b] Based on the result, above does it appear that the computer store has been given laptops of lower than average quality C} Please also do explain how to solve using Excel
Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.
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